You have a small typo in the documentation
<com.polyak.iconswitch.IconSwitch
android:isw_icon_size="@dimen/your_size" />
<com.polyak.iconswitch.IconSwitch
android:isw_default_selection="left|right" />
This should look like
<com.polyak.iconswitch.IconSwitch
app:isw_icon_size="@dimen/your_size" />
<com.polyak.iconswitch.IconSwitch
app:isw_default_selection="left|right" />
You have a small typo in the documentation
<com.polyak.iconswitch.IconSwitch
android:isw_icon_size="@dimen/your_size" />
<com.polyak.iconswitch.IconSwitch
android:isw_default_selection="left|right" />
This should look like
<com.polyak.iconswitch.IconSwitch
app:isw_icon_size="@dimen/your_size" />
<com.polyak.iconswitch.IconSwitch
app:isw_default_selection="left|right" />